It is a 66-1 from 1911, I have put in the original back clamp presser bar and forward only stitch regulator. This seems to make the machine happier. I may put in the side clamp bar just to see how well it'll stitch but right now for short bursts it's doing well. So I'm thinking I'm also the problem. If the fabric isn't sitting under the needle fairly square it seems to glide away at a curve. The short piece of double layer fabric has the first two lines from the top using a fabric guide. Each successive line is just the machine running on its own, no guide
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You see some have a slight curve and return. What am I doing?
Ps: I'm also an unseasoned sewer so the fabric not sitting square or other user error is on my own head